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| Maternal age | Case n (%) | Control n (%) |
|---|---|---|
| ≤ 20 years | 6 (9.0) | 15 (13.3) |
| > 20 – 30 years | 26 (38.8) | 66 (58.4) |
| > 30 – 35 years | 7 (10.4) | 23 (20.3) |
| > 35 years | 28 (41.8) | 9 (8.0) |
